color, package and action bar configuration.

shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java

Index: shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
diff --git a/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java b/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
index 00af1e2189019aeabbcfcc4d498e22d09a2a073c..275331b63f1e87ab86de05c195614f82d0166007 100644
--- a/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
+++ b/shared/src/main/java/org/chromium/customtabsclient/shared/CustomTabsHelper.java
@@ -19,6 +19,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.graphics.Color;
 import android.net.Uri;
 import android.text.TextUtils;
 import android.util.Log;
@@ -55,12 +56,12 @@ public class CustomTabsHelper {
      * the one chosen by the user if there is one, otherwise makes a best effort to return a
      * valid package name.
      *
-     * This is <strong>not</strong> threadsafe.
-     *
      * @param context {@link Context} to use for accessing {@link PackageManager}.
-     * @return The package name recommended to use for connecting to custom tabs related components.
+     * @param packagesSupportingCustomTabs All packages that support custom tabs.
+     * @return
      */
-    public static String getPackageNameToUse(Context context) {
+    public static String getPackageNameToUse(Context context,
+                                             List<String> packagesSupportingCustomTabs) {
         if (sPackageNameToUse != null) return sPackageNameToUse;
 
         PackageManager pm = context.getPackageManager();
@@ -72,18 +73,6 @@ public class CustomTabsHelper {
             defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
         }
 
-        // Get all apps that can handle VIEW intents.
-        List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
-        List<String> packagesSupportingCustomTabs = new ArrayList<>();
-        for (ResolveInfo info : resolvedActivityList) {
-            Intent serviceIntent = new Intent();
-            serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
-            serviceIntent.setPackage(info.activityInfo.packageName);
-            if (pm.resolveService(serviceIntent, 0) != null) {
-                packagesSupportingCustomTabs.add(info.activityInfo.packageName);
-            }
-        }
-
         // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
         // and service calls.
         if (packagesSupportingCustomTabs.isEmpty()) {
@@ -107,6 +96,38 @@ public class CustomTabsHelper {
     }
 
     /**
+     * @see #getPackageNameToUse(Context, List<String).
+     */
+    public static String getPackageNameToUse(Context context) {
+        if (sPackageNameToUse != null) return sPackageNameToUse;
+        return getPackageNameToUse(context, getAllPackagesSupportingCustomTabs(context));
+    }
+
+    /**
+     * Get all apps that support custom tabs. We can tell whether an app supports custom tabs by
+     * sending uri visit intent.
+     * @param context
+     * @return an Arraylist of package name.
+     */
+    public static ArrayList<String> getAllPackagesSupportingCustomTabs(Context context) {
+        PackageManager pm = context.getPackageManager();
+        // Get default VIEW intent handler.
+        Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
+        // Get all apps that can handle VIEW intents.
+        List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
+        ArrayList<String> packagesSupportingCustomTabs = new ArrayList<>();
+        for (ResolveInfo info : resolvedActivityList) {
+            Intent serviceIntent = new Intent();
+            serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
+            serviceIntent.setPackage(info.activityInfo.packageName);
+            if (pm.resolveService(serviceIntent, 0) != null) {
+                packagesSupportingCustomTabs.add(info.activityInfo.packageName);
+            }
+        }
+        return packagesSupportingCustomTabs;
+    }
+
+    /**
      * Used to check whether there is a specialized handler for a given intent.
      * @param intent The intent to check with.
      * @return Whether there is a specialized handler for the given intent.